SMTPUTF8 for exim

J

justin_h

Verified User
Joined
Sep 1, 2023
Messages
7
Hello,
We have a problem sending emails to one specific recipient because of lack of SMTPUTF8 support on our end (probably). When sending emails to them, they bounce back with error
SMTPUTF8 is required, but was not offered by host
Click to expand...
They seem to be using microsofts smtp (outlook)
If i check our server with tls tool i see:
https://imgur.com/a/WnWRUVW

I tried adding allow_utf8_domains = true in /etc/exim.conf file but that made no difference. What are my other options to enable utf8 ?
Directadmin v1.650
Exim v4.96
 
You might need to settings:
Code: 
allow_utf8_domains = true
smtputf8_advertise_hosts = *
then don't forget to restart exim first.

Be aware of the fact that on an exim.conf update these settings can be overwritten.

Also... it might be these setting need to be at a certain place, maybe on top or in a certain #edit, I'm not sure about that.
 
Richard G said:
You might need to settings:
Code: 
allow_utf8_domains = true
smtputf8_advertise_hosts = *
then don't forget to restart exim first.

Be aware of the fact that on an exim.conf update these settings can be overwritten.

Also... it might be these setting need to be at a certain place, maybe on top or in a certain #edit, I'm not sure about that.
Click to expand...
Thanks for the reply. I already tried putting those two in the exim.conf but with
smtputf8_advertise_hosts = *
Click to expand...
Exim always fails to start. Would be nice to know if there is any other option or where to put these lines.
 
Are you sure this isn't a problem with their mail server? You said this is when you send email to them, your server reports back that their server doesn't support a necessary protocol, right? That's how I'm reading it.
 
Sorry apparently we cant RECEIVE emails from one specific sender. They claim we are not receiving them, because our server does not support smtputf8 (which is visible in the photo i posted in the first post)
 
I run an entire email service with a total of 484,410 email accounts, going since 2013, and I have never once run into this issue. I would tell them something like "We use Exim, a standards-compliant email server with proper configuration. Please have your sender adjust their configuration as necessary to be able to communicate with other properly configured mail servers."

Because I don't see that exim docs state anywhere specific that allow_utf8_domains should be added in config (in a transport? in a router?), and the current version of exim isn't accepting it in the global config areas. But the bottom line is the error in question comes from a Postfix server, and two up to date and properly configured Postfix and Exim servers can communicate with each other, without issue. I really think that you should push back on the sender here, because even if you manage to adjust your exim configuration to compensate for whatever they've done wrong, you're going to have to apply that change to your exim.conf every single time you update exim, if it can't be added to one of the include files that DA's exim.conf includes by default (and it likely can't).
 
It will be hard to tell them that because they said they dont want to change anything on their end. We dont have any problems sending emails to anyone and everyone gets them to their inbox, we also receive emails from everyone. I do wander tho why exim does not support smtputf8 considering postfix, haraka, gmail, outlook does.
 
mxroute said:
We use Exim, a standards-compliant email server with proper configuration.
Click to expand...
Correct. However I do read that Exim needs to be compile with i18N support to be able to support smtputf8 according to the Exim docs.
On cPanel I have found the 2 settings, which also the Exim documentation is talking about and should work.
So I'm wondering if Exim is compiled with smtputf8 (or i18N) support here on DA.

From older threads here on DA it seems that only Postfix is complaining about this. But I never had the issue on our very small email services either, which is why I called in your help, because you have such a big mail system.
But seems you didn't encounter it either until now.
 
Thanks guys for the effort i will still try to look for the way to enable uft8 on exim
 
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